A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic of storytelling. It does not refer to any previous information and gives a broad overview of the primitive story-teller. This follows the rule of Topic Sentence. Why other lines are not chosen? The other paragraphs are not chosen because they do not stand alone. For example, Paragraph 2 starts with "Instead of telling the story himself," which needs context. Paragraph 3 starts with "Once upon a time," which is also not independent. Paragraph 4 uses "he may" which refers back to a character, so it is not independent.

Concluding sentence: Why this is the last line? This paragraph concludes the text by summarizing the different ways a modern writer can tell a story. It wraps up the discussion about storytelling methods, which follows the rule of Summary Style.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects with Paragraph 1 because it continues the idea of storytelling. The phrase "he began" shows a logical order from the primitive storyteller to a more developed way of telling a story.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects with Paragraph 2 because it shows how storytelling has changed. The phrase "The modern fiction writer" indicates a shift to a more complex way of storytelling, following the narrative from the previous paragraph.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects with Paragraph 3 because it gives examples of how the modern writer can tell a story. The phrase "Instead of telling the story himself" shows a logical flow from the methods discussed in the previous paragraph.